LUXEMBOURG - OCTOBER 20: (NO SALES, NO ARCHIVE) In this handout image provided by the Grand-Ducal Court of Luxembourg, Princess Stephanie of Luxembourg and Crown Prince Guillaume of Luxembourg are seen exchanging their vows during their wedding ceremony at the Cathedral of our Lady of Luxembourg on October 20, 2012 in Luxembourg, Luxembourg. The 30-year old hereditary Grand Duke of Luxembourg is the last hereditary Prince in Europe to get married, marrying his 28-year old Belgian Countess bride in a lavish 2-day ceremony. (Photo by Guy Wolff/Grand-Ducal Court of Luxembourg via Getty Images)